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Hi, it was the heat exchanger. I think it was losing it little by little and evaporating or through steam, maybe it was dumping via the overflow but I could never catch it. Yesterday it went big time, was dripping water from the inside big time. Thanks for trying.

Hi, its not the expansion vessel as far as I can tell, it has air pressure. I am not losing any water outside of the boiler becuase all the pipes are above ground. The overflow is high up on the outside of the building. I have also put a board underneath the prv pipe to see if it gets wet, it...

Hi, I have a Puma 80e boiler that is losing pressure. It started with losing 1bar over a period of a day, but now losses 1 bar in about 4 hours. I have replaced the pump, fan, circuit board, and the prv. No water is dripping from the overflow attatched to the prv. Any ideas anybody?